Answer: Based on your description I am not certain what would have caused the browning. It is difficult to diagnose that kind of symptom long distance. So I would suggest you consult with your county extension and/or professionally trained and certified nurseryman to try to get a specific diagnosis. It may not be anything to worry about, but it could also possibly be something that should be treated such as a disease or pest problem. I am really sorry I can't be more specific for you.
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